Remove Velero pin

We no longer need to pin this, and it blocks the 2024.9.1 upgrade.
Let's use the latest from azimuth-ops.

Author: MoteHue

environments/tav1/inventory/group_vars/all/variables.yml

@@ -82,8 +82,3 @@ terraform_s3_bucket: azimuth-staging-state
 
 # Valero backup & recovery
 velero_s3_url: https://object-store.os-api.tav1.ecmwf.int:8883/
-
-# Velero additional config
-velero_release_overrides:
-  image:
-    tag: v1.12.1